3P71

Crystal structure of the complex of LCMT-1 and PP2A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Structural Basis for Tight Control of PP2A Methylation and Function by LCMT-1.

Stanevich, V.Jiang, L.Satyshur, K.A.Li, Y.Jeffrey, P.D.Li, Z.Menden, P.Semmelhack, M.F.Xing, Y.

(2011) Mol.Cell 41: 331-342

  • DOI: 10.1016/j.molcel.2010.12.030

  • PubMed Abstract: 
  • Proper formation of protein phosphatase 2A (PP2A) holoenzymes is essential for the fitness of all eukaryotic cells. Carboxyl methylation of the PP2A catalytic subunit plays a critical role in regulating holoenzyme assembly; methylation is catalyzed b ...

    Proper formation of protein phosphatase 2A (PP2A) holoenzymes is essential for the fitness of all eukaryotic cells. Carboxyl methylation of the PP2A catalytic subunit plays a critical role in regulating holoenzyme assembly; methylation is catalyzed by PP2A-specific methyltransferase LCMT-1, an enzyme required for cell survival. We determined crystal structures of human LCMT-1 in isolation and in complex with PP2A stabilized by a cofactor mimic. The structures show that the LCMT-1 active-site pocket recognizes the carboxyl terminus of PP2A, and, interestingly, theĀ PP2A active site makes extensive contacts to LCMT-1. We demonstrated that activation of the PP2A active site stimulates methylation, suggesting a mechanism for efficient conversion of activated PP2A into substrate-specific holoenzymes, thus minimizing unregulated phosphatase activity or formation of inactive holoenzymes. A dominant-negative LCMT-1 mutant attenuates the cell cycle without causing cell death, likely by inhibiting uncontrolled phosphatase activity. Our studies suggested mechanisms of LCMT-1 in tight control of PP2A function, important for the cell cycle and cell survival.


    Organizational Affiliation

    McArdle Laboratory, Department of Oncology, School of Medicine and Public Health, University of Wisconsin at Madison, Madison, WI 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Leucine carboxyl methyltransferase 1
T
334Homo sapiensMutation(s): 4 
Gene Names: LCMT1 (LCMT)
EC: 2.1.1.233
Find proteins for Q9UIC8 (Homo sapiens)
Go to Gene View: LCMT1
Go to UniProtKB:  Q9UIC8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform
C
304Homo sapiensMutation(s): 0 
Gene Names: PPP2CA
EC: 3.1.3.16
Find proteins for P67775 (Homo sapiens)
Go to Gene View: PPP2CA
Go to UniProtKB:  P67775
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
C
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
AN6
Query on AN6

Download SDF File 
Download CCD File 
C
5'-{[(3S)-3-amino-3-carboxypropyl](ethyl)amino}-5'-deoxyadenosine
C16 H25 N7 O5
GAMUFACDOHMHSZ-OPYVMVOTSA-N
 Ligand Interaction
PEG
Query on PEG

Download SDF File 
Download CCD File 
T
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.192 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.802α = 90.00
b = 65.305β = 90.00
c = 193.092γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
ADSCdata collection
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-02-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-10-08
    Type: Database references
  • Version 1.3: 2014-10-15
    Type: Structure summary